German D2 Steel

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Redmasta said:
I'm not even going to say what that looks like lol
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:D




Ok, question... BM says theirs is Crucible D2. Does that mean its CPMD2, powdered/particle metallurgy style?

I've read where Crucible only did a limited batch of this, but it is the internet after all.

Good stuff either way.
 
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Professor said:
:D




Ok, question... BM says theirs is Crucible D2. Does that mean its CPMD2, powdered/particle metallurgy style?

I've read where Crucible only did a limited batch of this, but it is the internet after all.

Good stuff either way.
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The answer you seek is on the first page of this thread. Either way, I sharpened my D2 710 this past week and it was hard. But well worth it!
 
Professor said:
:D




Ok, question... BM says theirs is Crucible D2. Does that mean its CPMD2, powdered/particle metallurgy style?

I've read where Crucible only did a limited batch of this, but it is the internet after all.

Good stuff either way.
Click to expand...

To my understanding, Benchmade's D2 is not made with the CPM process.

Someone would have to confirm this as I cannot find the thread, but I recall vaguely reading quite a few years ago that Sal G. noted that they experimented with Crucible's D2 and Crucible's CPM-D2 and found that the gains were not nearly as pronounced compared to applying the CPM to some other common cutlery-grade steels (such as 154CM or M4). Which is contrasted significantly with something like 154CM versus CPM-154 in which the performance gains are so dramatic that it is like they are two different steels. (And I strongly wish makers like Benchmade and Emerson would consider using CPM-154 and heat treating to a higher hardness that CPM-154 would allow as it is just an amazing performer.) I do like the Spyderco Paramilitary in CPM-D2 (the original PM with green handle) and I really dislike most of the production D2 steel I have used (never used Dozier's D2 which I hear is incredible).
 
^ This is what my research led me to conclude also, that the modest performance gains were not worth it. Ended up leading me to the Spyderco forums.

At any rate, BM's D2 is good stuff. Over two years of carry and use attests.
 
pnsxyr said:
To my understanding, Benchmade's D2 is not made with the CPM process.

Someone would have to confirm this as I cannot find the thread, but I recall vaguely reading quite a few years ago that Sal G. noted that they experimented with Crucible's D2 and Crucible's CPM-D2 and found that the gains were not nearly as pronounced compared to applying the CPM to some other common cutlery-grade steels (such as 154CM or M4). Which is contrasted significantly with something like 154CM versus CPM-154 in which the performance gains are so dramatic that it is like they are two different steels. (And I strongly wish makers like Benchmade and Emerson would consider using CPM-154 and heat treating to a higher hardness that CPM-154 would allow as it is just an amazing performer.) I do like the Spyderco Paramilitary in CPM-D2 (the original PM with green handle) and I really dislike most of the production D2 steel I have used (never used Dozier's D2 which I hear is incredible).
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This is because CPM process in general are intended to make more evenly mixed steel. Remember when if the steel is melted, heavy material sinks to the bottom and lighter one goes to the top, pronouncing uneven mix. As many of you know that CPM does not liquefy all material, but sinter ultrafine powder under pressure and heat to fuse them together.

It sees that the reason 154cm benefits would be that it doesn't have Vanadium, a known carbide growth restrictor. CPM process would accentuate this over cordially process.

MFL
 
A molten steel exists as a solution and I would not expect heavy and light elements to separate by gravity. Like sugar or salt dissolved in water as a solution. This is not to say that there may not be insoluble phases present, depending on where on the eutectic diagram you are but generally the components are dissolved in solution.
 
Don M said:
A molten steel exists as a solution and I would not expect heavy and light elements to separate by gravity. Like sugar or salt dissolved in water as a solution. This is not to say that there may not be insoluble phases present, depending on where on the eutectic diagram you are but generally the components are dissolved in solution.
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If you recall chemistry, melted alloy in NOT a solution. You do realize steel is an alloy, not an element already.

Non-uniform distribution of elements within stainless sleet is not a separation (Like sand and silt in water sediment, but rather non uniformed distribution of elements within liquefied metal.) If in theory, 154cm produced in null gravity furnace would be more evenly distributed than on gravity environment.


MFL
 
Yes, I remember chemistry. And yes, a molten alloy is fully in solution if it is above the liquidus line. If you cool below this line you start seeing crystals form that are not soluble in the solution. But above the liquidus all the elements (and they are all elements) are dissolved in solution. The heat input in the furnace should result in plenty of convection to keep the solution mixed.
 
I have been accused of that...by my wife. That's what happens when an engineer marries a free spirit. She likes to think we need each other - that I help her have order and organization while she helps me have a life.
 
Don M said:
I have been accused of that...by my wife. That's what happens when an engineer marries a free spirit. She likes to think we need each other - that I help her have order and organization while she helps me have a life.
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The prof's phallic droid got a smile but this made me chuckle out loud - LOL'ed I believe the younger generation would have.
 
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